// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_CERT_SIGNED_TREE_HEAD_H_
#define NET_CERT_SIGNED_TREE_HEAD_H_

#include <stdint.h>

#include <iosfwd>
#include <string>
#include <vector>

#include "base/time/time.h"
#include "net/base/hash_value.h"
#include "net/base/net_export.h"
#include "net/cert/signed_certificate_timestamp.h"

namespace net {

namespace ct {

    static const uint8_t kSthRootHashLength = 32;

    // Signed Tree Head as defined in section 3.5. of RFC6962
    struct NET_EXPORT SignedTreeHead {
        // Version enum in RFC 6962, Section 3.2. Note that while in the current
        // RFC the STH and SCT share the versioning scheme, there are plans in
        // RFC6962-bis to use separate versions, so using a separate scheme here.
        enum Version { V1 = 0,
        };

        SignedTreeHead();
        SignedTreeHead(Version version,
            const base::Time& timestamp,
            uint64_t tree_size,
            const char sha256_root_hash[kSthRootHashLength],
            const DigitallySigned& signature,
            const std::string& log_id);
        SignedTreeHead(const SignedTreeHead& other);
        ~SignedTreeHead();

        Version version;
        base::Time timestamp;
        uint64_t tree_size;
        char sha256_root_hash[kSthRootHashLength];
        DigitallySigned signature;

        // Added in RFC6962-bis, Appendix A. Needed to identify which log
        // this STH belongs to.
        std::string log_id;
    };

    NET_EXPORT void PrintTo(const SignedTreeHead& sth, std::ostream* os);

    NET_EXPORT bool operator==(const SignedTreeHead& lhs,
        const SignedTreeHead& rhs);
    NET_EXPORT bool operator!=(const SignedTreeHead& lhs,
        const SignedTreeHead& rhs);

} // namespace ct

} // namespace net

#endif
